Fig. 3

Nomogram and calibration curves. a Nomogram for the prediction of lymph node metastasis. b Calibration curves of the nomogram in the training cohort and c testing cohort. Calibration curves depict the calibration of the nomogram in terms of agreement between the predicted risk of lymph node metastasis and observed outcomes. The 45-degree blue dotted lines represent perfect prediction, and the pink lines represent the predictive performance of the nomogram. The closer the dotted line fit to the ideal line, the better the predictive accuracy of the nomogram. LN lymph node, CT computed tomography. Abbreviation RS1 Radiomic signature 1, RS2 radiomic signature 2